tmp/tmp0rv95dk5/{from.md → to.md}
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### Class template `binder1st` <a id="depr.lib.binder.1st">[[depr.lib.binder.1st]]</a>
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``` cpp
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template <class Fn>
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class binder1st
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: public unary_function<typename Fn::second_argument_type,
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typename Fn::result_type> {
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protected:
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Fn op;
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typename Fn::first_argument_type value;
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public:
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binder1st(const Fn& x,
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const typename Fn::first_argument_type& y);
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typename Fn::result_type
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operator()(const typename Fn::second_argument_type& x) const;
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typename Fn::result_type
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operator()(typename Fn::second_argument_type& x) const;
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};
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```
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The constructor initializes `op` with `x` and `value` with `y`.
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`operator()` returns `op``(value,x)`.
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